Journal tags: css

There’s a new proposal for giving developers more control over styling form controls. I like it.

It’s clearly based on the fantastic work being done by the Open UI group on the select element. The proposal suggests that authors can opt-in to the new styling possibilities by declaring:

appearance: base;

So basically the developer is saying “I know what I’m doing—I’m taking the controls.” But browsers can continue to ship their default form styles. No existing content will break.

The idea is that once the developer has opted in, they can then style a number of pseudo-elements.

This proposal would apply to pretty much all the form controls you can think of: all the input types, along with select, progress, meter, buttons and more.

But there’s one element more that I wish were on the list:

legend

I know, technically it’s not a form control but legend and fieldset are only ever used within forms.

The legend element is notoriously annoying to style. So a lot of people just don’t bother using it, which is a real shame. It’s like we’re punishing people for doing the right thing.

Wouldn’t it be great if you, as a developer, had the option of saying “I know what I’m doing—I’m taking the controls”:

legend {
  appearance: base;
}

Imagine if that nuked the browser’s weird default styles, effectively turning the element into a span or div as far as styling is concerned. Then you could style it however you wanted. But crucially, if browsers shipped this, no existing content would break.

The shitty styling situation for legend (and its parent fieldset) is one of those long-standing annoyances that seems to have fallen down the back of the sofa of browser vendors. No one’s going to spend time working on it when there are more important newer features to ship. That’s why I’d love to see it sneak in to this new proposal for styling form controls.

I was in Amsterdam last week. Just like last year I was there to help out Vasilis’s students with a form-based assignment:

They’re given a PDF inheritance-tax form and told to convert it for the web.

Yes, all the excitement of taxes combined with the thrilling world of web forms.

(Side note: this time they were told to style it using the design system from the Dutch railway because the tax office was getting worried that they were making phishing sites.)

I saw a lot of the same challenges again. I saw how students wished they could specify a past date or a future date in a date picker without using JavaScript. And I saw them lamenting the time they spent styling legends that worked across all browsers.

Right now, Mason Freed has an open issue on the new proposal with his suggestion to add some more elements to consider. Both legend and fieldset are included. That gets a thumbs-up from me.

With the release of a new Salter Cane album I figured it was high time to update the design of the band’s website.

Here’s the old version for reference. As you can see, there’s a connection there in some of the design language. Even so, I decided to start completely from scratch.

I opened up a text editor and started writing HTML by hand. Same for the CSS. No templates. No build tools. No pipeline. Nothing. It was a blast!

And lest you think that sounds like a wasteful way of working, I pretty much had the website done in half a day.

Partly that’s because you can do so much with so little in CSS these days. Custom properties for colours, spacing, and fluid typography (thanks to Utopia). Logical properties. View transitions. None of this takes much time at all.

Because I was using custom properties, it was a breeze to add a dark mode with prefers-color-scheme. I think I might like the dark version more than the default.

The final stylesheet is pretty short. I didn’t bother with any resets. Browsers are pretty consistent with their default styles nowadays. As long as you’ve got some sensible settings on your body element, the cascade will take care of a lot.

There’s one little CSS trick I think is pretty clever…

The background image is this image. As you can see, it’s a rectangle that’s wider than it is tall. But the web pages are rectangles that are taller than they are wide.

So how I should I position the background image? Centred? Anchored to the top? Anchored to the bottom?

If you open up the website in Chrome (or Safari Technical Preview), you’ll see that the background image is anchored to the top. But if you scroll down you’ll see that the background image is now anchored to the bottom. The background position has changed somehow.

This isn’t just on the home page. On any page, no matter how tall it is, the background image is anchored to the top when the top of the document is in the viewport, and it’s anchored to the bottom when you reach the bottom of the document.

In the past, this kind of thing might’ve been possible with some clever JavaScript that measured the height of the document and updated the background position every time a scroll event is triggered.

But I didn’t need any JavaScript. This is a scroll-driven animation made with just a few lines of CSS.

@keyframes parallax {
    from {
        background-position: top center;
    }
    to {
        background-position: bottom center;
    }
}
@media (prefers-reduced-motion: no-preference) {
        html {
            animation: parallax auto ease;
            animation-timeline: scroll();
        }
    }
}

This works as a nice bit of progressive enhancement: by default the background image stays anchored to the top of the viewport, which is fine.

Once the site was ready, I spent a bit more time sweating some details, like the responsive images on the home page.

But the biggest performance challenge wasn’t something I had direct control over. There’s a Spotify embed on the home page. Ain’t no party like a third party.

I could put loading="lazy" on the iframe but in this case, it’s pretty close to the top of document so it’s still going to start loading at the same time as some of my first-party assets.

I decided to try a little JavaScript library called “lazysizes”. Normally this would ring alarm bells for me: solving a problem with third-party code by adding …more third-party code. But in this case, it really did the trick. The library is loading asynchronously (so it doesn’t interfere with the more important assets) and only then does it start populating the iframe.

This made a huge difference. The core web vitals went from being abysmal to being perfect.

I’m pretty pleased with how the new website turned out.

UX London isn’t the only event from Clearleft coming your way in 2025. There’s a brand new spin-off event dedicated to user research happening in February. It’s called Research By The Sea.

I’m not curating this one, though I will be hosting it. The curation is being carried out most excellently by Benjamin, who has written more about how he’s doing it:

We’ve invited some of the best thinkers and doers from from in the research space to explore how researchers might respond to today’s most gnarly and pressing problems. They’ll challenge current perspectives, tools, practices and thinking styles, and provide practical steps for getting started today to shape a better tomorrow.

If that sounds like your cup of tea, you should put February 27th 2025 in your calendar and grab yourself a ticket.

Although I’m not involved in curating the line-up for the event, I offered Benjamin my swor… my web dev skillz. I made the website for Research By The Sea and I really enjoyed doing it!

These one-day events are a great chance to have a bit of fun with the website. I wrote about how enjoyable it was making the website for this year’s Patterns Day:

I felt like I was truly designing in the browser. Adjusting spacing, playing around with layout, and all that squishy stuff. Some of the best results came from happy accidents—the way that certain elements behaved at certain screen sizes would lead me into little experiments that yielded interesting results.

I took the same approach with Research By The Sea. I had a design language to work with, based on UX London, but with more of a playful, brighter feel. The idea was that the website (and the event) should feel connected to UX London, while also being its own thing.

I kept the typography of the UX London site more or less intact. The page structure is also very similar. That was my foundation. From there I was free to explore some other directions.

I took the opportunity to explore some new features of CSS. But before I talk about the newer stuff, I want to mention the bits of CSS that I don’t consider new. These are the things that are just the way things are done ‘round here.

Custom properties. They’ve been around for years now, and they’re such a life-saver, especially on a project like this where I’m messing around with type, colour, and spacing. Even on a small site like this, it’s still worth having a section at the start where you define your custom properties.

Logical properties. Again, they’ve been around for years. At this point I’ve trained my brain to use them by default. Now when I see a left, right, width or height in a style sheet, it looks like a bug to me.

Fluid type. It’s kind of a natural extension of responsive design to me. If a website’s typography doesn’t adjust to my viewport, it feels slightly broken. On this project I used Utopia because I wanted different type scales as the viewport increased. On other projects I’ve just used on clamp declaration on the body element, which can also get the job done.

Okay, so those are the things that feel standard to me. So what could I play around with that was new?

View transitions. So easy! Just point to an element on two different pages and say “Hey, do a magic move!” You can see this in action with the logo as you move from the homepage to, say, the venue page. I’ve also added view transitions to the speaker headshots on the homepage so that when you click through to their full page, you get a nice swoosh.

Unless, like me, you’re using Firefox. In that case, you won’t see any view transitions. That’s okay. They are very much an enhancement. Speaking of which…

Scroll-driven animations. You’ll only get these in Chromium browsers right now, but again, they’re an enhancement. I’ve got multiple background images—a bunch of cute SVG shapes. I’m using scroll-driven animations to change the background positions and sizes as you scroll. It’s a bit silly, but hopefully kind of cute.

You might be wondering how I calculated the movements of each background image. Good question. I basically just messed around with the values. I had fun! But imagine what an actually-skilled interaction designer could do.

That brings up an interesting observation about both view transitions and scroll-driven animations: Figma will not help you here. You need to be in a web browser with dev tools popped open. You’ve got to roll up your sleeves get your hands into the machine. I know that sounds intimidating, but it’s also surprisingly enjoyable and empowering.

Oh, and I made sure to wrap both the view transitions and the scroll-driven animations in a prefers-reduced-motion: no-preference @media query.

I’m pleased with how the website turned out. It feels fun. More importantly, it feels fast. There is zero JavaScript. That’s the main reason why it’s very, very performant (and accessible).

Smooth transitions across pages; smooth animations as you scroll: it’s great what you can do with just HTML and CSS.

Earlier this year I wrote about some performance improvements to The Session using the content-visibility property in CSS.

If you say content-visibility: auto you’re telling the browser not to bother calculating the layout and paint for an element until it needs to. But you need to combine it with the contain-intrinsic-block-size property so that the browser knows how much space to leave for the element.

I mentioned the browser support:

Right now content-visibility is only supported in Chrome and Edge. But that’s okay. This is a progressive enhancement. Adding this CSS has no detrimental effect on the browsers that don’t understand it (and when they do ship support for it, it’ll just start working).

Well, that’s happened! Safari 18 supports content-visibility. I didn’t have to do a thing and it just started working.

But …I think I’ve discovered a little bug in Safari’s implementation.

(I say I think it’s a bug with the browser because, like Jim, I’ve made the mistake in the past of thinking I had discovered a browser bug when in fact it was something caused by a browser extension. And when I say “in the past”, I mean yesterday.)

So here’s the issue: if you apply content-visibility: auto to an element that contains an SVG, and that SVG contains a text element, then Safari never paints that text to the screen.

To see an example, take a look at the fourth setting of Cooley’s reel on The Session archive. There’s a text element with the word “slide” (actually the text is inside a tspan element inside a text element). On Safari, that text never shows up.

I’m using a link to the archive of The Session I created recently rather than the live site because on the live site I’ve removed the content-visibility declaration for Safari until this bug gets resolved.

I’ve also created a reduced test case on Codepen. The only HTML is the element containing the SVGs. The only CSS—apart from the content-visibility stuff—is just a little declaration to push the content below the viewport so you have to scroll it into view (which is when the bug happens).

I’ve filed a bug report. I know it’s a fairly niche situation, but there are some other issues with Safari’s implementation of content-visibility so it’s possible that they’re all related.

I’ve been going buildless—or as Brad crudely puts it, raw-dogging websites on a few projects recently. Not just obviously simple things like Clearleft’s Browser Support page, but sites like:

• The Clearleft podcast
• Patterns Day
• UX London

They also have 0 dependencies.

Like Max says:

Funnily enough, many build tools advertise their superior “Developer Experience” (DX). For my money, there’s no better DX than shipping code straight to the browser and not having to worry about some cryptic node_modules error in between.

Making websites without a build step is a gift to your future self. When you open that project six months or a year or two years later, there’ll be no faffing about with npm updates, installs, or vulnerabilities.

Need to edit the CSS? You edit the CSS. Need to change the markup? You change the markup.

It’s remarkably freeing. It’s also very, very performant.

If you’re thinking that your next project couldn’t possibly be made without a build step, let me tell you about a phrase I first heard in the indie web community: “Manual ‘till it hurts”. It’s basically a two-step process:

1. Start doing what you need to do by hand.
2. When that becomes unworkable, introduce some kind of automation.

It’s remarkable how often you never reach step two.

I’m not saying premature optimisation is the root of all evil. I’m just saying it’s premature.

Start simple. Get more complex if and when you need to.

You might never need to.

My stint as one of the hosts of CSS Day went very well indeed. I enjoyed myself and people seemed to like the cut of my jib.

During the event there was a real buzz on Mastodon, which was heartening to see. I was beginning to worry that hashtagging events was going to be collatoral damage from Elongate, but there was plenty of conference-induced FOMO to be experienced on the fediverse.

The event itself was, as always, excellent. Both in terms of content and organisation.

Some themes emerged during CSS Day, which I always love to see. These emergent properties are partly down to curation and partly down to serendipity.

The last few years of CSS Day have felt like getting a firehose of astonishing new features being added to the language. There was still plenty of cutting-edge stuff this year—masonry! anchor positioning!—but there was also a feeling of consolidation, asking how to get all this amazing new stuff into our workflows.

Matthias’s opening talk on day one and Stephen’s closing talk on the same day complemented one another perfectly. Both managed to inspire while looking into the nitty-gritty practicalities of the web design process.

It was, astoundingly, Matthias’s first ever conference talk. I have no doubt it won’t be the last—it was great!

I gave Stephen a good-natured roast in my introduction, partly because it was his birthday, partly because we’re old friends, but mostly because it was enjoyable for me to watch him squirm. Of course his talk was, as always, superb. Don’t tell him, but he might be one of my favourite speakers.

The topic of graphic design tools came up more than once. It’s interesting to see how the issues with them have changed. It used to be that design tools—Photoshop, Sketch, Figma—were frustrating because they were writing cheques that CSS couldn’t cash. Now the frustration is the exact opposite. Our graphic design tools aren’t capable of the kind of fluid declarative design we can now accomplish in web browsers.

But the biggest rift remains not with tools or technologies, but with people and mindsets. Our tools can reinforce mindsets but the real divide happens in how different people approach CSS.

Both Josh and Kevin get to the heart of this in their tremendous tutorials, and that was reflected in their talks. They showed the difference between having the bare minimum understanding of CSS in order to get something done as quickly as possible, and truly understanding how CSS works in order to open up a world of possibilities.

For people in the first category, Sarah Dayan was there to sing the praises of utility-first CSS AKA atomic CSS. I commend her bravery!

During the Q&A, I restrained myself from being too Paxmanish. But I did have l’esprit d’escalier afterwards when I realised that the entire talk—and all the answers afterwards—depended on two mutually-incompatiable claims:

1. The great thing about atomic CSS is that it’s a constrained vocabulary so your team has to conform, and
2. The other great thing about it is that it’s utility-first, not utility-only so you can break out of it and use regular CSS if you want.

Insert .gif of character from The Office looking to camera.

Most of the questions coming in during the Q&A reflected my own take: how about we use utility classes for some things, but not all things. Seems sensible.

Anyway, regardless of what I or anyone else thinks about the substance of what Sarah was saying, there was no denying that it was a great presentation. They were all great presentations. That’s unusual, and I say that as a conference organiser as well as an attendee. Everyone brings their A-game to CSS Day.

Mind you, it is exhausting. I say it every year, but it always feels like one talk too many. Not that any individual talk wasn’t good, but the sheer onslaught of deep dives into the innards of CSS has my brain exploding before the day is done.

A highlight for me was getting to introduce Fantasai’s talk on the design principles of CSS, which was right up my alley. I don’t think most people realise just how much we owe her for her years of work on standards. The web would be in a worse place without the Herculean work she’s done behind the scenes.

Another highlight was getting to see some of the students I met back in March. They were showing some of their excellent work during the breaks. I find what they’re doing just as inspiring as the speakers on stage.

In fact, when I was filling in the post-conference feedback form, there was a question: “Who would you like to see speak at CSS Day next year?” I was racking my brains because everyone I could immediately think of has already spoken at some point. So I wrote, “It would be great to see some of those students speaking about their work.”

I think it would be genuinely fascinating to get their perspective on what we consider modern CSS, which to them is just CSS.

Either way I’ll back next year for sure.

It’s funny, but usually when a conference is described as “inspiring” it’s because it’s tackling big galaxy-brain questions. But CSS Day is as nitty-gritty as it gets and I found it truly inspiring. Like, I couldn’t wait to open up my laptop and start writing some CSS. That kind of inspiring.

I haven’t spoken at any conferences so far this year, and I don’t have any upcoming talks. That feels weird. I’m getting kind of antsy to give a talk.

I suspect my next talk will have something to do with HTML web components. If you’re organising an event and that sounds interesting to you, give me a shout.

But even though I’m not giving a conference talk this year, I’m doing a fair bit of hosting. There was the lovely Patterns Day back in March. And this week I’m off to Amsterdam to be one of the hosts of CSS Day. As always, I’m very much looking forward to that event.

Once that’s done, it’ll be time for the biggie. UX London is just two weeks away—squee!

There are still tickets available. If you haven’t got yours yet, I highly recommend getting it before midnight on Friday—that’s when the regular pricing ends. After that, it’ll be last-chance passes only.

Those HTML web components I made for date inputs are very simple. All they do is slightly extend the behaviour of the existing input elements.

This would be the ideal use-case for the is attribute:

<input is="input-date-future" type="date">

Alas, Apple have gone on record to say that they will never ship support for customized built-in elements.

So instead we have to make HTML web components by wrapping existing elements in new custom elements:

<input-date-future>
  <input type="date">
<input-date-future>

The end result is the same. Mostly.

Because there’s now an additional element in the DOM, there could be unexpected styling implications. Like, suppose the original element was direct child of a flex or grid container. Now that will no longer be true.

So something I’ve started doing with HTML web components like these is adding something like this inside the connectedCallback method:

connectedCallback() {
    this.style.display = 'contents';
  …
}

This tells the browser that, as far as styling is concerned, there’s nothing to see here. Move along.

Or you could (and probably should) do it in your stylesheet instead:

input-date-future {
  display: contents;
}

Just to be clear, you should only use display: contents if your HTML web component is augmenting what’s within it. If you add any behaviours or styling to the custom element itself, then don’t add this style declaration.

It’s a bit of a hack to work around the lack of universal support for the is attribute, but it’ll do.

There’s a lovely CSS property called hanging-punctuation. You can use it to do exactly what the name suggests and exdent punctuation marks such as opening quotes.

Here’s one way to apply it:

html {
  hanging-punctuation: first last;
}

Any punctuation marks at the beginning or end of a line will now hang over the edge, leaving you with nice clean blocks of text; no ragged edges.

Right now it’s only supported in Safari but there’s no reason not to use it. It’s a perfect example of progressive enhancement. One line of CSS to tidy things up for the browsers that support it and leave things exactly as they are for the browsers that don’t.

But when I used this over on The Session I noticed an unintended side-effect. Because I’m applying the property globally, it’s also acting on form fields. If the text inside a form field starts with a quotation mark or some other piece of punctuation, it’s shunted off to the side and hidden.

Here’s the fix I used:

input, textarea {
  hanging-punctuation: none;
}

It’s a small little gotcha but I figured I’d share it in case it helps someone else out.

I love it when I come across some bit of CSS I’ve never heard of before.

Take this article on the text-emphasis property.

“The what property?”, I hear you ask. That was my reaction too. But look, it’s totally a thing.

Or take this article by David Bushell called CSS Button Styles You Might Not Know.

Sure enough, halfway through the article David starts talking about styling the button in an input type="file” using the ::file-selector-button pseudo-element:

All modern browsers support it. I had no idea myself until recently.

He’s right!

Then I remembered that I’ve got a file upload input in the form I use for posting my notes here on adactio.com (in case I want to add a photo). I immediately opened up my style sheet, eager to use this new-to-me bit of CSS.

I found the bit where I style buttons and this is the selector I saw:

button,
input[type="submit"],
::file-selector-button

Huh. I guess I did know about that pseudo-element after all. Clearly the knowledge exited my brain shortly afterwards.

There’s that tautological cryptic saying, “You don’t know what you don’t know.” But I don’t even know what I do know!

When I wrote about my time in Amsterdam last week, I mentioned the task that the students were given:

They’re given a PDF inheritance-tax form and told to convert it for the web.

Rich had a question about that:

I’m curious to know if they had the opportunity to optimise the user experience of the form for an online environment, eg. splitting it up into a sequence of questions, using progressive disclosure, branching based on inputs, etc?

The answer is yes, very much so. Progressive disclosure was a very clear opportunity for enhancement.

You know the kind of paper form where it says “If you answered no to this, then skip ahead to that”? On the web, we can do the skipping automatically. Or to put it another way, we can display a section of the form only when the user has ticked the appropriate box.

This is a classic example of progressive disclosure:

information is revealed when it becomes relevant to the current task.

But what should the mechanism be?

This is an interaction design pattern so JavaScript seems the best choice. JavaScript is for behaviour.

On the other hand, you can do this in CSS using the :checked pseudo-class. And the principle of least power suggests using the least powerful language suitable for a given task.

I’m torn on this. I’m not sure if there’s a correct answer. I’d probably lean towards JavaScript just because it’s then possible to dynamically update ARIA attributes like aria-expanded—very handy in combination with aria-controls. But using CSS also seems perfectly reasonable to me.

It was interesting to see which students went down the JavaScript route and which ones used CSS.

It used to be that using the :checked pseudo-class involved an adjacent sibling selector, like this:

input.disclosure-switch:checked ~ .disclosure-content {
  display: block;
}

That meant your markup had to follow a specific pattern where the elements needed to be siblings:

<div class="disclosure-container">
  <input type="checkbox" class="disclosure-switch">
  <div class="disclosure-content">
  ...
  </div>
</div>

But none of the students were doing that. They were all using :has(). That meant that their selector could be much more robust. Even if the nesting of their markup changes, the CSS will still work. Something like this:

.disclosure-container:has(.disclosure-switch:checked) .disclosure-content

That will target the .disclosure-content element anywhere inside the same .disclosure-container that has the .disclosure-switch. Much better! (Ignore these class names by the way—I’m just making them up to illustrate the idea.)

But just about every student ended up with something like this in their style sheets:

.disclosure-content {
  display: none;
}
.disclosure-container:has(.disclosure-switch:checked) .disclosure-content {
  display: block;
}

That gets my spidey-senses tingling. It doesn’t smell right to me. Here’s why…

The simpler selector is doing the more destructive action: hiding content. There’s a reliance on the more complex selector to display content.

If a browser understands the first ruleset but not the second, that content will be hidden by default.

I know that :has() is very well supported now, but this still makes me nervous. I feel that the more risky action (hiding content) should belong to the more complex selector.

Thanks to the :not() selector, you can reverse the logic of the progressive disclosure:

.disclosure-content {
  display: block;
}
.disclosure-container:not(:has(.disclosure-switch:checked)) .disclosure-content {
  display: none;
}

Now if a browser understands the first ruleset, but not the second, it’s not so bad. The content remains visible.

When I was explaining this way of thinking to the students, I used an analogy.

Suppose you’re building a physical product that uses electricity. What should happen if there’s a power cut? Like, if you’ve got a building with electric doors, what should happen when the power is cut off? Should the doors be locked by default? Or is it safer to default to unlocked doors?

It’s a bit of a tortured analogy, but it’s one I’ve used in the past when talking about JavaScript on the web. I like to think about JavaScript as being like electricity…

Take an existing product, like say, a toothbrush. Now imagine what you can do when you turbo-charge it with electricity: an electric toothbrush!

But also consider what happens when the electricity fails. Instead of the product becoming useless you want it to revert back to being a regular old toothbrush.

That’s the same mindset I’m encouraging for the progressive disclosure pattern. Make sure that the default state is safe. Then enhance.

I was in Amsterdam last week. Usually I’m in that city for an event like the excellent CSS Day. Not this time. I was there as a guest of Vasilis. He invited me over to bother his students at the CMD (Communications and Multimedia Design) school.

There’s a specific module his students are partaking in that’s right up my alley. They’re given a PDF inheritance-tax form and told to convert it for the web.

Yes, all the excitement of taxes combined with the thrilling world of web forms.

Seriously though, I genuinely get excited by the potential for progressive enhancement here. Sure, there’s the obvious approach of building in layers; HTML first, then CSS, then a sprinkling of JavaScript. But there’s also so much potential for enhancement within each layer.

Got your form fields marked up with the right input types? Great! Now what about autocomplete, inputmode, or pattern attributes?

Got your styles all looking good on the screen? Great! Now what about print styles?

Got form validation working? Great! Now how might you use local storage to save data locally?

As well as taking this practical module, most of the students were also taking a different module looking at creative uses of CSS, like making digital fireworks, or creating works of art with a single div. It was fascinating to see how the different students responded to the different tasks. Some people loved the creative coding and dreaded the progressive enhancement. For others it was exactly the opposite.

Having to switch gears between modules reminded me of switching between prototypes and production:

Alternating between production projects and prototyping projects can be quite fun, if a little disorienting. It’s almost like I have to flip a switch in my brain to change tracks.

Here’s something I noticed: the students love using :has() in CSS. That’s so great to see! Whereas I might think about how to do something for a few minutes before I think of reaching for :has(), they’ve got front of mind. I’m jealous!

In general, their challenges weren’t with the vocabulary or syntax of HTML, CSS, and JavaScript. The more universal problem was project management. Where to start? What order to do things in? How long to spend on different tasks?

If you can get good at dealing with those questions and not getting overwhelmed, then the specifics of the actual coding will be easier to handle.

This was particularly apparent when it came to JavaScript, the layer of the web stack that was scariest for many of the students.

I encouraged them to break their JavaScript enhancements into two tasks: what you want to do, and how you then execute that.

Start by writing out the logic of your script not in JavaScript, but in whatever language you’re most comfortable with: English, Dutch, whatever. In the course of writing this down, you’ll discover and solve some logical issues. You can also run your plain-language plan past a peer to sense-check it.

It’s only then that you move on to translating your logic into JavaScript. Under each line of English or Dutch, write the corresponding JavaScript. You might as well put // in front of the plain-language sentence while you’re at it to make it a comment—now you’ve got documentation baked in.

You’ll still run into problems at this point, but they’ll be the manageable problems of syntax and typos.

So in the end, it wasn’t my knowledge of specific HTML, CSS, or JavaScript APIs that proved most useful to pass on to the students. It was advice like that around how to approach HTML, CSS, or JavaScript.

I also learned a lot during my time at the school. I had some very inspiring conversations with the web developers of tomorrow. And I was really impressed by how much the students got done just in the three days I was hanging around.

I’d love to do it again sometime.

I wrote a little while back about improving performance on The Session by reducing runtime JavaScript in favour of caching on the server. This is on the pages for tunes, where the SVGs for the sheetmusic are now inlined instead of being generated on the fly.

It worked. But I also wrote:

A page like that with lots of sheetmusic and plenty of comments is going to have a hefty page weight and a large DOM size. I’ve still got a fair bit of main-thread work happening, but now the bulk of it is style and layout, whereas previously I had the JavaScript overhead on top of that.

Take a tune like Out On The Ocean. It has 27 settings. That’s a lot of SVG markup that needs to be parsed, styled and rendered, even if it’s inline.

Then I remembered a very handy CSS property called content-visibility:

It enables the user agent to skip an element’s rendering work (including layout and painting) until it is needed — which makes the initial page load much faster.

Sounds great! But there are two gotchas.

The first gotcha is that if a browser doesn’t paint the element, it doesn’t know how much space the element should take up. So you need to provide dimensions. At the very least you need to provide a height value. Otherwise when the element comes into view and gets rendered, it pushes down on the content below it. You’d see a sudden jump in the scrollbar position.

The solution is to provide a value for contain-intrinsic-size. If your content is dynamic—from, say, a CMS—then you’re out of luck. You don’t know how long the content is.

Luckily, in my case, I could take a stab at it. I know how many lines of sheetmusic there are for each tune setting. Each line takes up roughly the same amount of space. If I multiply that amount of space by the number of lines then I’ve got a pretty good approximation of the height of the sheetmusic. I apply this with the contain-intrinsic-block-size property.

So each piece of sheetmusic has an inline style attribute with declarations like this:

content-visibility: auto;
contain-intrinsic-block-size: 380px;

It works a treat. I did a before-and-after check with pagespeed insights on the page for Out On The Ocean. The “style and layout” part of the main thread work went down considerably. Total blocking time went from more than 600 milliseconds to less than 400 milliseconds.

Not a bad result for a little bit of CSS!

I said there was a second gotcha. That’s browser support.

Right now content-visibility is only supported in Chrome and Edge. But that’s okay. This is a progressive enhancement. Adding this CSS has no detrimental effect on the browsers that don’t understand it (and when they do ship support for it, it’ll just start working). I’ve said it before and I’ll say it again: the forgiving error-parsing in HTML and CSS is a killer feature of the web. Browsers just ignore what they don’t understand. That’s what makes progressive enhancement like this possible.

And actually, there’s something you can do for all browsers. Even browsers that don’t support content-visibility still understand containment. So they’ll understand contain-intrinsic-size. Pair that with a contain declaration like this to tell the browser that this chunk of content isn’t going to reflow or get repainted:

contain: layout paint;

Here’s what MDN says about contain:

The contain CSS property indicates that an element and its contents are, as much as possible, independent from the rest of the document tree. Containment enables isolating a subsection of the DOM, providing performance benefits by limiting calculations of layout, style, paint, size, or any combination to a DOM subtree rather than the entire page.

So if you’ve got a chunk of static content, you might as well apply contain to it.

Again, not bad for a little bit of CSS!

I had a lot of fun making the website for Patterns Day.

If you’re interested in the tech stack, here’s what I used:

1. HTML
2. CSS

Actually, technically it’s all HTML because the styles are inside a style element rather than a separate style sheet, but you know what I mean. Also, there is technically some JavaScript but all it does is register a service worker that takes care of caching and going offline.

I didn’t use any build tools. There was no pipeline. There is no node_modules folder filling up my hard drive. Nothing was automated. The website was hand-crafted the long hard stupid way.

I started with the content. I wrote out the words and marked them up with the most appropriate HTML elements.

Time to layer on the presentation.

For the design, I turned to Michelle for help. I gave her a brief, describing the vibe of the conference, and asked her to come up with an appropriate visual language.

Crucially, I asked her not to design a website. Instead I asked her to think about other places where this design language might be used: a poster, social media, anything but a website.

Partly I was doing this for my own benefit. If you give me a pixel-perfect design for a web page and tell me to code it up, either I won’t do it or I won’t enjoy it. I just don’t get any motivation out of that kind of direct one-to-one translation.

But give me guardrails, give me constraints, give me boundary conditions, and off I go!

Michelle was very gracious in dealing with such a finicky client as myself (“Can you try this other direction?”, “Hmm… I think I preferred the first one after all!”) She delivered a colour palette, a type scale, typeface choices, and some wonderful tiling patterns …it is Patterns Day after all!

With just a few extra lines of CSS, the basic typography was in place.

I started layering on the colours. Even though this was a one-page site, I still made liberal use of custom properties in the CSS. It just feels good to be able to update one value and see the results, well …cascade.

I had a lot of fun with the tiling background images. SVG was the perfect format for these. And because the tiles were so small in file size, I just inlined them straight into the CSS.

By this point, I felt like I was truly designing in the browser. Adjusting spacing, playing around with layout, and all that squishy stuff. Some of the best results came from happy accidents—the way that certain elements behaved at certain screen sizes would lead me into little experiments that yielded interesting results.

I’m not sure it’s possible to engineer that kind of serendipity in Figma. Figma was the perfect tool for exploring ideas around the visual vocabulary, and for handing over design decisions around colour, typography, and texture. But when it comes to how the content is going to behave on the World Wide Web, nothing beats a browser for fidelity.

By this point I was really sweating the details, like getting the logo just right and adjusting the type scale for different screen sizes. Needless to say, Utopia was a godsend for that.

I was also checking back in with Michelle to get her take on design decisions I was making.

I could’ve kept tinkering but the diminishing returns were a sign that it was time to put this out into the world.

It felt really good to work on a web page like this. It felt like I was getting my hands into the soil of the web. I don’t think it’s an accident that the result turned out to be very performant.

Getting hands-on like this stops me from getting rusty. And honestly, working with CSS these days is a joy. There’s such power to be had from using var() in combination with functions like calc() and clamp(). Layout is a breeze with flexbox and grid. Browser differences are practically non-existent. We’ve never had it so good.

Here’s something I noticed about my relationship to CSS; my brain has finally made the switch to logical properties. Now if I’m looking at some CSS and I see left, right, top, or bottom, it looks like a bug to me. Those directional properties feel loaded with assumptions whereas logical properties feel much more like working with the grain of the web.

Every week of June sees me at a web event, but in a different capacity each time.

At the end of the first full week in June, I went to CSS Day in Amsterdam as an attendee. It was thought-provoking, as always. And it was great to catch up with my front-of-the-front-end friends.

Last week I went to Pixel Pioneers in Bristol as a speaker. Fortunately I was on first so I was able to get the speaking done with and enjoy the rest of the talks. It was a lovely little event and there was yet more catching up with old friends and making new ones.

This week is the big one. UX London is happening this week. This time I’m not there as an attendee or a speaker. I’m there as the curator and host.

On the one hand, I’m a bag of nerves. I’ve been preparing for this all year and now it’s finally happening. I keep thinking of all the things that could possibly go wrong.

On the other hand, I’m ridiculously excited. I know I should probably express some modesty, but looking at the line-up I’ve assembled, I feel an enormous sense of pride. I’m genuinely thrilled at the prospect of all those great talks and workshops.

Nervous and excited. Those are the two wolves inside me right now.

If you’re going to be at UX London, I hope that you’re equally excited (and not nervous). There are actually still some last-minute tickets available if you haven’t managed to get one yet.

See you there!

I first spoke at CSS Day in Amsterdam back in 2016. Well, technically it was the HTML Day preceding CSS Day, when I talked about the A element. I spoke at CSS Day again last year, when I gave a presentation about alternative histories of styling.

One of the advantages to having spoken at the event in the past is that I’m offered a complementary ticket to the event every year. That’s an offer I’ve made the most of.

I’ve just returned from the latest iteration of CSS Day. It was, as always, excellent. I’ve said it before and I’ll say it again, but I just love the way that this event treats CSS with the respect it deserves. I always attend thinking “I know CSS”, but I always leave thinking “I learned a lot about CSS!”

The past few years have been incredibly exciting for the language. We’ve been handed feature after feature, including capabilities we were told just weren’t possible: container queries; :has; cascade layers; view transitions!

As Paul points out in his write-up, there’s been a shift in how these features feel too. In the past, the feeling was “there’s some great stuff arriving and it’ll be so cool once we’ve got browser support.” Now the feeling is finally catching up to the reality: these features are here now. If browser support for an exciting feature is still an issue, wait a few weeks.

Mind you, as Paul also points out, maybe that’s down to the decreased diversity in rendering engines. If a feature ships in Chromium, Webkit, and Gecko, then it’s universally supported. On the one hand, that’s great for developers. But on the other hand, it’s not ideal for the ecosystem of the web.

Anyway, as expected, there was a ton of mind-blowing stuff at CSS Day 2023. Most of the talks were deep dives into specific features. Those deep dives were bookended by big-picture opening and closing talks.

Manuel closed out the show by talking about he’s changing the way he writes and thinks about CSS. I think that’s a harbinger of what’s to come in the next year or so. We’ve had this wonderful burst of powerful new features over the past couple of years; I think what we’ll see next is consolidation. Understanding how these separate pieces play well together is going to be very powerful.

Heck, just exploring all the possibilities of custom properties and :has could be revolutionary. When you add in the architectural implications of cascade layers and container queries, it feels like a whole new paradigm waiting to happen.

That was the vibe of Una’s opening talk too. It was a whistle-stop tour of all the amazing features that have already landed, and some that will be with us very soon.

But Una also highlighted the heartbreaking disparity between the brilliant reality of CSS in browsers today versus how the language is perceived.

Look at almost any job posting for front-end development and you’ll see that CSS still isn’t valued as its own skill. Never mind that you could specialise in a subset of CSS—layout, animation, architecture—and provide 10× value to an organisation, the recruiters are going to play it safe and ask you if you know React.

Rachel Nabors and I were chatting about this gap between the real and perceived value of modern CSS. She astutely pointed out that CSS is kind of a victim of its own resilience. The way you wrote CSS ten years ago still works, and will continue to work. That’s by design. Yes, you can write much better, more resilient CSS today, but if those qualities aren’t valued by an organisation, then you’re casting your pearls before swine.

That said, it’s also true that the JavaScript you wrote ten years ago also continues to work today and will continue to work in the future. So why is it that devs seem downright eager to try the latest JavaScript hotness but are reluctant to use CSS that’s been stable for years?

Or perhaps that’s not an accurate representation of the JavaScript ecosystem. It may well be that the eagerness only extends to libraries and frameworks. There’s reluctance to embrace native JavaScript APIs like Proxy or web components. There’s a weird lack of trust in web standards, and an underserved faith in third-party libraries.

Una speculated that CSS needs a rebranding, like we did back in the days of CSS3, a term which didn’t have any technical meaning but helped galvinise excitement.

I’m not so sure. A successful rebranding today becomes a millstone tomorrow. Again, see CSS3.

Una finished with a call-to-action. Let’s work on building the CSS community.

She compared the number of “front-end” conferences dedicated to JavaScript—over 50 listed on one website—to the number of conferences dedicated to CSS. There’s just one. CSS Day.

Heydon wrote:

It occurs to me there are two types of web conferences: know-your-craft conferences and get-ahead conferences. It’s no coincidence there are simultaneously more get-ahead conferences and more JS-framework conferences.

Una encouraged us to organise more gatherings. It doesn’t need to be a conference. It could just be a local meet-up.

I think that’s an excellent suggestion. As Manuel puts it:

My biggest takeaway: The CSS community needs you!

For me, the value of CSS Day was partly in the excellent content being presented, but it was also in the opportunity to gather with like-minded individuals and realise I’m not alone. It’s also too easy to get gaslit by the grift of “modern web development”, which seems to be built on a foundation of user-hostile priorities that don’t make sense to me—over-engineering, intertwingling of concerns, and developer experience über alles. CSS Day was a welcome reminder to fuck that noise.

While I’m talking about the SVGs on The Session, I thought I’d share something else related to the rendering of the sheet music.

Like I said, I use the brilliant abcjs JavaScript library. It converts ABC notation into sheet music on the fly, which still blows my mind.

If you view source on the rendered SVG, you’ll see that the path and rect elements have been hard-coded with a colour value of #000000. That makes sense. You’d want to display sheet music on a light background, probably white. So it seems like a safe assumption.

Ah, but when it comes to front-end development, assumptions are like little hidden bombs just waiting to go off!

I got an email the other day:

Hi Jeremy,

I have vision problems, so I need to use high-contrast mode (using Windows 11). In high-contrast mode, the sheet-music view is just black!

Doh! All my CSS adapts just fine to high-contrast mode, but those hardcoded hex values in the SVG aren’t going to be affected by high-contrtast mode.

Stepping back, the underlying problem was that I didn’t have a full separation of concerns. Most of my styling information was in my CSS, but not all. Those hex values in the SVG should really be encoded in my style sheet.

I couldn’t remove the hardcoded hex values—not without messing around with JavaScript beyond my comprehension—so I made the fix in CSS:

[fill="#000000"] {
  fill: currentColor;
}
[stroke="#000000"] {
  stroke: currentColor;
}

That seemed to do the trick. I wrote back to the person who had emailed me, and they were pleased as punch:

Well done, Thanks!  The staff, dots, etc. all appear as white on a black background.  When I click “Print”, it looks like it still comes out black on a white background, as expected.

I’m very grateful that they brought the issue to my attention. If they hadn’t, that assumption would still be lying in wait, preparing to ambush someone else.

Two weeks ago, I wrote:

I woke up today to a very annoying new bug in Firefox. The browser shits the bed in an unpredictable fashion when rounding up single pixel line widths in SVG. That’s quite a problem on The Session where all the sheet music is rendered in SVG. Those thin lines in sheet music are kind of important.

Paul Rosen, who makes abcjs, the JavaScript library that renders sheet music on The Session, managed to get a fix out pretty quickly. But I use an older version of the library and updating it would introduce some side-effects that would take me a while to work around. So that option wasn’t available to me.

In this situation, when the problem is caused by a browser bug, the correct course of action is to file a bug with the browser. That had already been done. Now all I could do was twiddle my thumbs and wait for the next release of the browser, which would hopefully ship with the fix.

But I figured I may as well try to find a temporary workaround in the meantime.

At first, I looked at diving into the internals of the JavaScript—that’s where the instructions are given for drawing the SVGs.

But then I stopped and thought, “If the problem is with the rendering of the SVG, maybe CSS can help.”

I started messing around with SVG-specific CSS properties like stroke, fill, and so on. With dev tools open, I started targeting the paths that acted as bar lines in the sheet music, playing around with widths, opacities, and fills.

It was the debugging equivalent of throwing spaghetti at the wall. Remarkably, it actually worked.

I found a solution with this nonsensical bit of CSS:

stroke: currentColor;
stroke-opacity: 0;

For some reason, rather than making all the barlines disappear, this ensured they were visible.

It’s the worst kind of hacky fix—the kind where you have no idea why it works, but it does.

So I shipped it.

And at pretty much exactly the same time, a new version of Firefox dropped …with the bug fixed.

I can’t deny that there was a certain satisfaction in being able to work around a browser bug. But there’s much more satisfaction in deleting the hacky workaround when it’s no longer needed.

Ever get the urge to style a good document?

No? Just me, then.

Well, the urge came over me recently so I started styling this single-page site:

A Few Notes On The Culture by Iain M Banks

I’ve followed this document across multiple locations over the years. It started life as a newsgroup post on rec.arts.sf.written in 1994. Ken McLeod published it there on Iain M Banks’s behalf.

The post complements the epic series of space opera books that Iain M Banks set in the anarcho-utopian society of The Culture. It’s a fascinating piece of world building, as well as an insight into the author’s mind.

I first became aware of it many few years later, after a copy had been posted to the web. That URL died, but Adrian Hon kept a copy on his site. Lots of copies keep stuff safe, so after contemplating linkrot, I made a copy on this site too.

But I recently thought that maybe it deserved a bit of art direction, so I rolled up my sleeves and started messing around, designing in the browser and following happy little accidents.

The finished result is still fairly sparse. It’s still entirely text, except for a background image that shows up if your screen is wide enough. That image of a planet originally started as an infra-red snapshot of Jupiter by the James Webb Space Telescope that I worked over until it was unrecognisable.

The text itself is the main focus of the design though. I knew I wanted to play around with a variable font. Mona Sans from Github was one of the first ones I tried and I found it instantly suitable. I had a lot of fun playing with different weights and widths.

After a bit of messing around, I realised that the heading styles were reminding me of some later reissues of The Culture novels, so I leant into that, deliberately styling the byline to resemble the treatment of the author’s name on those book covers.

There isn’t all that much CSS. I’ve embedded it in the head of the HTML rather than linking to a separate style sheet, so feel free to view source and poke around in there. You’ll see that I’m making liberal use of custom properties, the clamp function, and logical properties.

Originally I had a light mode and dark mode but I found that the dark mode was much more effective so I ditched the lighter option.

I did make sure to include some judicious styles for print, so if you fancy reading on paper, it should print out nicely.

Oh, and of course it’s a progressive web app that works offline.

I didn’t want to mess with the original document other than making some typographic tweaks to punctuation, but I wanted to break up the single wall of text. I wasn’t about to start using pull quotes on the web so in the end I decided to introduce some headings that weren’t in the original document:

1. Government
2. Economics
3. Technology
4. Philosophy
5. Lifestyle
6. Travel
7. Habitat
8. Legal System
9. Politics
10. Identity
11. Nomenclature
12. Cosmology

If your browser viewport is tall enough, the heading for the current section you’re reading will remain sticky as you scroll. No JavaScript required.

I’m pretty pleased with how this little project turned out. It was certainly fun to experiment with fluid type and a nice variable font.

I can add this to my little collection of single-page websites I’ve whittled over the years:

• A Few Notes On The Culture
• The Gęsiówka Story
• Design Principles
• Brighton SF

Some lovely people have recently made some lovely websites.

Dan has launched his type foundry, Simple Type Co. and it’s gorgeous!

For as long as I’ve been making websites, Dan’s designs have been an inspiration: Corkd, Dribbble, his own website; whenever he unveils something it always sits just right with me.

Oh, and I love the tagline for Simple Type Co.:

Never perfect. Always a-okay.

Someone who is a perfectionist is Marcin. He’s been working on his book about keyboards for years now (the Kickstarter project will launch in February) and he’s made a stunning website for the book called Shift Happens. Click around and find out.

Mandy has a lovely new professional website, courtesy of Ethan. It’s called everything changes. I love the subtletly of the different colour schemes for dark and light modes. It’s almost as if Ethan knows a thing or two about responsive design.

Look! Jason has new professional website too. The text is just scrumptious. It’s almost as if Jason knows a thing or two about typography.

And look! Lynn has done it again—a new site design for a new year. Beautiful stuff, as always—have a look through the archive if you want to the creativity she puts into this every single year.

All of these people are my web design heroes.